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Armbuster, (57) in an anatomical study of the adult hip, found no correlation between the center-edge angle and either the teardrop configuration or the distance between the acetabular line and the ilioischial line.
Hubbard (35) required the acetabular line to cross the ilioischial line as part of his diagnostic criteria.
Certainly, patients with protrusio acetabuli tend to have a center-edge angle greater than the reported normal upper limit of 46[degrees]; the teardrop configuration tends to be closed, crossed, or reversed; and the acetabular line tends to cross Kohler's line by more than 3 mm in men and more than 6 mm in women.